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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f62f66d0b2cac3bf2692d2413ab769e0076f701853c15745bf028f6f523c7ac' 
  AND token = 'cEthBeouS+nym99wa8KzPy+XkVeS4g2FT/IskJjjt14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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