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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a5aeb7002cbbc335255d8886948262a491cb8bc53278b4b3fbc0e5167b5b68' 
  AND token = '8wWxaqf7/dB9bUaqS7Eq66LaPM2llXIr2H7FqeENa4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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