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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa79e047fc28e35c3a4f64106147e597fd9bc58c1dfef717382bbf43d71005b7' 
  AND token = 'eWsqWHJZwADx9FBsWNuGeAjiNZx+dfb872iIp3Auth8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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