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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b667c849090dd936cc75bd46f25600ebff7ca46ef9a221484ea3037887d58ad4' 
  AND token = '+NEulJuklUkh0FK57qCbI0u+ujdf3U+Bcl80C//q5Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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