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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c17629ac8e1742d64f1142921f940f9115f7c09689c603535cf5ebd755de2e0a' 
  AND token = 'yYJCEfeF0LDCbL56GPFz1Mvfbh2zjgQh7DzK99WfMd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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