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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b04e7c4c9b864731f3438ff69f6c0741dcfa40f17729dacb7977d65fdc5aea0' 
  AND token = 'vaAVepzAN/EKdjkHbqtC7IspBH+u8k1BNHJL6+YnSCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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