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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e616b975bc8a2231901365b35c8e3c9923c156f0cc785a57652e1586994e114' 
  AND token = '3pF/QxSDxKBxJ2yqq1jLJTqXRhsCd55U2BbfGU26+XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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