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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2cc053f8e6031467873355a7e15d375a2b5c6ffdf3bf0b9a3c10d83c81a4df' 
  AND token = '+6kafED5qpkRMwJbfbHBjKwkVgiSpCD/M4GTMX5MZnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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