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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1922ed1b861af0210282ae2a5c8b71bc962bec6673a06280986fd8c57f8d1700' 
  AND token = 'dzfNz9Wed4LH0CKN7J1h6LI60ncu7oq+FuJsl3X8vVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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