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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cfe1eafb24a099cc3afe0bf50bcb03a4ffcf8d9d23dd4e1432c79e2721f689d' 
  AND token = 'ocr4qupDQdOOfqNLpkYU+6szN+A/ni6xArfQgXfFEso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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