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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dbeaee788ac955d397b94f3dfaa2580ff9e8725b2c1ff72f5c478a51fc1e9b0' 
  AND token = 'X0Z7zD7/CT5fEzZBAtQgrl2dzzp36Wv3i4DDSFSwm/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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