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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c211bce76013e71b44cee9397b535e3e98c2229ee11ae7971a7a9852f0d612d6' 
  AND token = 'XCcIssAn5gysRNAnvqL52znjgZBRQM3gNF0rJ/1KNFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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