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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866d57e045dfedc39da33985ed428a3fab0be06392aad02e7086d8283e46fe99' 
  AND token = 'Kn3hmdPOh4wiKssY/OwF562E71yVWQjU3BwGbmSPxbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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