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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60eb969b4df125648941d1675301f5e6c0353edac98c892bf020986aa1d19150' 
  AND token = 'QXJ9A6Xifs4PGbUv9Gd9DiJw6NL4b1zPX8CAzoD8YB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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