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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '921a7b63463e6227bc2ac25193daee9d9bc3eb4f1dfc526922e01d68af5ed717' 
  AND token = 'VRorBMNVS7WmFA6/dPTkI7cQb0gVWUAOqAt0uQpmTMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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