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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac5816554a1f6cec368ea12f7da903a4eed17051ef7df5b75b2313c1c1bc396' 
  AND token = 'pHOq3r2wOga951sLM8yabdX8P1IYpqqMLAdXRR5+A8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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