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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6994c9da2fdafae5dc01be3df3bf6d49c306f27d68d1dd0cbda97ce5e8fb26a6' 
  AND token = 'CIZ15NqOk7jBtTm4O3O4VfxYRId2A7F+QHgCqCd2m1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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