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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d74d58d12ca01e8f2934e844b24457b6617d1aa3a0b2889a79cc6738e535ea' 
  AND token = '3iw9nMyRBoseKpntGZZ9/4JTcgRxQO3xfklS6dDC+54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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