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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d0f8229d8d32ef23ca3b9a1aaaf18b8e802f54b43bdfcfafdb03cfd6fd1ce5f' 
  AND token = 'zbLs0GhzWLARAbx1Tp41WsRhYfnv1/kSaKvkP9nbOwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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