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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684d14dc980a234a1d89ceeec1a1880c6be90b62313ac929e33ae8f1a9fb2b59' 
  AND token = 'D5O3tbdsKQEpgRwfFCKJykZUuRMjfRTJ1aL3FI0LxxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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