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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6bef80a54c8a00e942d0f08819bd2e6553933a495f72f4a14b8e92a180ec54' 
  AND token = '/MrZblKWy79wKZAKmWJEdeys80ERR/URq3gJ3EQs9bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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