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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d8c442d791ee1692b83e48bef1599c828f249a38bc376671865813c53c7f9d3' 
  AND token = 'nOBWtgQf0xGrpdFOY33k6YUYMieJOzb6rLDJeyGzW2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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