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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702ae5e21ce65c5b777d2066f53b09f7f34ea02052063fdae201f3d1ea4edb21' 
  AND token = 'LkDhWh2HmhsVDHxF6WYIwdAD9fPynh4WErddXN6XQS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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