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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a886665a6612aad09a83c71b6ea0382d8920abb2436f18fca0fb1e056858fa6' 
  AND token = 'ik2hldiKiCJlPzAe8vt5MQaJYWEMU4oIIVknuf2b5G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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