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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b22f7f9cdeb73d95450cb839ab2124d27e648ae0e8db80d7fa6ccebc8862f993' 
  AND token = '1dobkNGfrQLaI/0lS4oaeYWSu9h6FPIA9jtNRnfEywE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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