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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b494e066b99cc431e03fff6227ac99f4d8b0cf784e9bb63a15a4ff0a3a787d' 
  AND token = 'BzfBz4RMEW2buBlVQ548oj49fQ4y3ujrM7gihttcHv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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