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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18a466c66cfc58efbc218b599ee2d126f5040c706b918ca8cbe5556d06bc1269' 
  AND token = '8hSEp5z4ymOL97aywANgqQOOsGbFOMfpaYVbxFrPk+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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