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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08473c6adf9e4945dce8b1cd5a634c6b1673adf1964ab53c3ac421c87ba6149f' 
  AND token = 'kCbTYL5v2BroCMo0ZOrIb+qP02zjuoZBBSGv9x0UTWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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