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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d55f038a6258726331625bf63e168785e5310dbc586f73deb0c178b9d05922' 
  AND token = 'rCRYDhfEW3O6RGFZDX6R9fGDDJp9tO6QL+H6adfeq34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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