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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56072802ad4f6c8ae6fb893a44a1e3826591a605349f4274672daf86c34ffc7c' 
  AND token = '8jEp1AY6zL65pbsnSGc9grsfALRmRcrOnpbsngSg/EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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