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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0deffa857673421254b01b419b5a5bbe28e3a988ca15c2e460cfe6f93755a9d' 
  AND token = '5gV54KbP+jK2A13yNEQS7LhiplyqOkBvygEQ9k1myq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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