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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9791aea21ace4728a2e5340f92d8530bda03476cd637e5be299031596e2c685' 
  AND token = 'duJCFDzu9WnrHx/kzws8EH34XE6I43c68mZ8xrIgp5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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