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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c58687775b1503994a284a13ffc31d92061e44935fde493812e6a2c4722d4ec' 
  AND token = 'btnmPVO6ZVxc9n3NKbTA66c7EGASZT70ikzQqWq03go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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