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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19036ac1bdcd8ec9b44b269deac02e03b3e77d39ee691de5c2b866b83d43b466' 
  AND token = 'MRwfDgZu/k6eNy8vjyfqpTyoGedplBnY5PrjtPmFLR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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