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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35eb3f3f86f917f57336eac642ef7b5b94eb681cdcaf427d4e24052123e32fb5' 
  AND token = 'HmoPmgkg39VAGZJAfLCZFU/f453iuRo39Qn2q7h8GKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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