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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585a856ad9099e6a5caba37b0c9cbe5acbd49c45a259ab30791e11e6693bea47' 
  AND token = 'NqzxTq0whfjjmlbO5cdwQ8fshtYT2WhB1L2wiZ6guEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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