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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026d4a3c6dfa34fa46339987234206656c1b1004f432bf89297532dd51aba8dc' 
  AND token = '09Tc3f1zpL/uTkYHhgvRx5bt+2ACoUOuMgHvIBof8rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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