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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b468c99129a1ac06988ac91f6c8dfc4037e409be3f84d694cb65ac6964094f' 
  AND token = 'bzoB8gRafG+hb+EX8DBfLmq2iHFal26dR7OQ+89ZWoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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