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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86af804bab7be7a01e6e704fb618a95ad8b876a4988258fb858625ffb8e0bab5' 
  AND token = 'fmhN43ErXnpTe4oQpsKPE1VrBfB8auUqzbiio63cD4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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