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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a8c12806b0d56e818b30e738f5e4395210a1f9d9741449d6c8c83a4f2d2d01' 
  AND token = 'YU6WlG6yllpwRSe5ejlpm61L9C6M8mMR6FaihKRjcbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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