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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575f9551dd4f8c13dcf3788ca9760fe9f8840bedbbf6310d751b4d443a6bb03c' 
  AND token = '3dKlZb7YHii4EqcDGV+OfMxMPa2Ae/FKjjaWn12ob60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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