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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f508f0bf8e7d866bf3434e992d73dc7aa180310b3a688ad0c13c5ad53f56b7b' 
  AND token = 'rBKdNQJjM5vebyA1Nd3zEoZYZe75kvFAasEdA0BdStM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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