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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9497c72c1c13f0ef9388e57a0e36c2056a9e072ae6206f1db44c8f7f5bab6ff2' 
  AND token = 'DN8E9lYbkzJI5gMUuCXmfN3CWB8uHOwH1Xq5IiN+q4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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