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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ed20f66362b3bb7e58d8db288a3c9ae9b711a51c6c909c6a220502797c9ebb' 
  AND token = 'n1CckSyJMqciE6ZtdBwkg8ujQE9dgdQscJvUpKiLcUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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