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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f055f56a7523934cf02b6d33ffa1021a8021f4700db433820ca771cea8e0ab5' 
  AND token = 'GnT+V6V62eoTO2eWcTMCZEmiJLKPa1m00snp0YX3wyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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