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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b367a7943c61f5a02e2e04425428daf06986ea4587968ef295118f3133a31d9' 
  AND token = 'lRdvSDx36ej1BUI9WIgcfzijGgG4dusK8tKIQkOaClY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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