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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d2c2ab31c7cffb8a612aa8d6cd8ec12b637123aa1abfba2c01d690a4429f82c' 
  AND token = '3uRjntYhVOndUGAc6v3JArwvtCu+sOHwsBUf/XwA0qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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