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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2dfe330a8f678964825f5b16a44e9f0589af8e14931a197abac64a701986f1e' 
  AND token = 'ngs1bqfmLh88q17nooY/iIk0s0tIfvGw9TCqfd6cWDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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