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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be27a8f27e4fa97a003d644c8fc733cd554401d4cb26ef69db90fbc51e14e0bc' 
  AND token = 'a9XiedP6/DeFknwZbys4H7zagkqGmEyAPGeGHxZ8iVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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