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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '733f77cfca2c4d547e8dbefb5a7eaf333872b59fa8ad0a54b2cfade5849e3147' 
  AND token = 'f/Wh59QkvYs0o403X88gwj0nLGNAsi0t938d/rNgzys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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