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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2de2b69a2fa19b23d42e29f517e83f991dd0506da2c36f2d62b08b32b9267c9' 
  AND token = 'sGz1+rDWKlUB2ayXa3LqKIrqvK25k5CnpNWvO9ThoM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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