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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e71421845f8f8c7ed1f89d93b91fd672057ae079e1784a4dc3ca48c1481c58d' 
  AND token = 'fHqW8cvUfB6My9ZBFqf9/IttztwoA5eQHavXxxbhP4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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