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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f116a67b4d628799a8b8ad21817fdfb3e936d1d294e5e63bad4984dff86d86ed' 
  AND token = 'cDgKE91ogRIMcTNWzPrOumh6a6M3NTSzj9DalpeucsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}