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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c5632511f9b20688f138dd1fda0aba0653b141df15cd04fb8cc4b70cf95e22e' 
  AND token = 'aMU7U8fshROQjTnjIuE91DKpnwntoaVTpvEsQBxBNmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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