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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770b568b68cae59059b3f579e483f7378d8752a8790b264391c7882076114c5d' 
  AND token = 'Jt7AFm3X95h3SnzXilnYYBeNklK0NhXduDCDe2aCjb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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