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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9a30b6eab1f64d36f1ef3e32dcb70ecdb78b4714b06b9f26bb40d452822981' 
  AND token = 'gEGn9+1Bip3gNNXViED2Cga6SoNDvlnxNoW+GArm6X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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