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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e974f128cedaf5e8edcbe47665e28fa9353207d50851af2450e57e926ae8d732' 
  AND token = 'DN5jX3xBAbbsrFGdFGBfTjTocRqlNFs+8njt3/hpXnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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