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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3aa1647241992df445acc046571da0512b78e37e0cd48335ba1962b4708b09' 
  AND token = 'SfwKO4aI+oP3hOuhqWsi8+obvf4vYpbBp5P6hecg+QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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