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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d905170c0ad6480c32c2810363338d309f4be275a580cc7641a7bf55d10db1f' 
  AND token = 'fK/5vR11HZOE3AFpFntIki0DhkEKgzV7tptDLCJqC9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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