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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c982f8e50bbd17785b0382cdf5808c80e54364e6d60c0db058fa2917a4c0d4' 
  AND token = '/JAYLWme7775kEn3UxaCQkKza6JMgBPxZLHNS+q+8dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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