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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71dd851305b4398fc3fa4c5ff73191584c8b35a089d7cdb8b8cecd4ee9eaba8' 
  AND token = 'Y/WvMqc7eTN3sgeI8w1UljEsynrzZ9o5tOiJAtWfLQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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