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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7e190079971eb41b29c645d9916959a3044efd431ec050b9c91038169fefcb' 
  AND token = 'Ea3hoDDsRbqt1wF7VHdewUKT38JnU+Sdn0QgBVEP/3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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