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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1618c7d43afecccda27d541773abe4ad2e3c9da57b22da4ee12ab8c667cf03' 
  AND token = 'T4oq9rfCurQqvwNbn1yLjghPMMua0kek8Q0bryz9tUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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