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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecbb92d1d701c01f341ec2cfa6a8ab492f4e9ce1b2fed4d3249839f529f822b7' 
  AND token = '695gGhsKbpFJ9Sdlqt/hZ3C85HCqKn7yYBOf4kHtux8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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