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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f28056510bd959eb8918d7b100550116518a8d81d18bdba970241eac1fb82d5' 
  AND token = 'ixjbiBLPCjdpclnSBPBdJt5aIsW85C22W/Zta8/quWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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